Unexcavated but appears to be a foundation cut for wall 6084 and perhaps 6086. After cleaning it was clear that there are also some blocks in the southeast corner, the crests of which are just visible underneath wall 6084, perhaps serving as foundation for the wall.
Floor and cuts in floor in southern portion of Room G-8
SU 6084, SU 6130, SU 6117, SU 6118; photo taken from the west
Photo from east